Start Date: Feb 01, 2010
End Date: Jan 31, 2014
Stagonospora nodorum will be used to produce extracts of the proteinaceous host-selective toxins (HSTs) that we have identified. HSTs will be purified and active fractions will be used to identify protein sequences using mass-spectrometry. Each of the presently characterized toxins has been shown to be a protein that interacts with a corresponding host sensitivity gene in an inverse gene-for-gene manner. Candidate genes will be revealed using the S. nodorum genome sequence. Additionally, bioinformatics will be used to scan the S. nodorum genome to identify candidate genes based on signal sequence domains and predicted protein size in addition to other relevant criteria. We have isolated a nonpathogenic strain of S. nodorum that appears to secrete no toxins. We will use this strain to verify toxin gene candidates. Candidate genes will initially be expressed in this isolate to verify toxin production and pathogenicity changes. Lastly, we will continue to identify new toxins using an international S. nodorum collection. This proposal will enhance economic opportunities for agricultural producers. This will be accomplished by providing valuable information to scientists including breeders for the improvement of wheat as a food crop especially as it relates to providing durable resistance sources to growers.